Source-monitoring abilities will be measured thanks to reality-monitoring testing (i.e. the ability to distinguish internal-generated events from external ones) and internal-monitoring testing (i.e. the ability to distinguish an imagined source from a performed one). A source-monitoring deficit have been demonstrated in patients with psychiatric conditions such as schizophrenia and seems linked to frontotemporal abnormalities (frontotemporal dysconnectivity and temporal hypoactivity). With a total of 150 patients, the investigators will include 30 patients per group: patients with pre-dementia stage Alzheimer, Alzheimer, Fronto-Temporal dementia, Lewy Body dementia or Parkinson and Bipolar Disorder, with the hypothesis that Bipolar Disorder patients will present less marked deficit. The investigators will recruit 150 healthy controls.
